The VIII Corps front was intersected by two deep ravines respectively called Gully Ravine, near the Ægean coast, and Krithia Nullah on the immediate left of the Krithia Road, and both of these, originating in the slopes of Achi Baba, formed deep furrows through the British lines, running towards the sea in a direction roughly parallel to the Krithia Road. The high ground between the ravines formed a plateau covered with scrub and gorse, and intersected in all directions by water courses of less importance; the whole area being uncomfortably exposed to direct observation from the Turkish defences on Achi Baba. All along this front the British and Turkish lines were close together--in some places only about 30 yards apart--and a continual and deadly warfare, in which bombs played a prominent part, was being waged from sapheads pushed out from the main defensive positions and held by barricades. The Royal Naval Division's subsector included several of such centres of activity, notably at the Northern and Southern Barricades, on the left, and at Worcester Barricade, a sap pushed forward from the Rue de Paris, in the centre. The exposure of the whole British area to observation rendered necessary the use of very long communication trenches, to afford cover to the mule transport whereby the trench garrisons were supplied with rations and trench stores. These wide mule tracks, doubled for upward and downward traffic, were carried forward from the crest of the plateau above the beaches at Cape Helles to within a few hundred yards of the front trenches. On the 20th October the 1st R.N. Brigade relieved the 2nd Brigade in the centre subsection, the forward system of trenches being occupied by "Drake," "Nelson," "Hood" and "Hawke," the 2/4th Londons relieving the 2/2nd Londons in the Eski line, a reserve line some 1500 yards in rear of the most advanced trenches. The Battalion occupied this line with two companies each side of the Eastern Mule Trench. The relief was carried out without difficulty, but during the move forward from bivouacs the Battalion incurred its first battle casualties, Capt. H. Morris and Privates Housden and Maunder being wounded.